Injector for feeding water to steam boilers



Oct. 20, 1931. B. T.' WILLISTON ET AL 3 INJECTOR FOR FEEDING WATER TO STEAM BOILERS Filed Aug. 16, 1929 I GSheets-Sheet 1 Jaws 272 1 47% 14 BY Wm 2.11m flfizfimw 'ATTORNEY.

Oct. 20, 1931. Y B. T. WILLISTON'ET AL 1,828,633

INJECTORFOR FEEDING WATER TO STEAM BOILERS Oct. 20, 1931.

B. T. WILLISTON ET AL 1,828,633

INJECTOR FOR FEEDING WA TER TO STEAM BOILERS 7 Filed. Aug. 16, 1929 6 Sheets-Sheet 3 A TTORNE Y.

Oct. 20, 1931. 5. T. WILLISTON ET AL 1,828,633

' INJECTOR FOR FEEDING WATER TO STEAM BOILERS Filed Aug. 16, 1929 e Sheets-Sheet 4 ATTORNEY.

Oct. 20, 12931."

B T. WILLISTON ET AL 1,828,633 INJECTOR FOR FEEDING WATER TO STEAM BOILERS I Filed Aug. 16. 1929 6 Sheets-Sheet 5 Im v llli'mr M t 2 I Q ,HIII l' ll l; I H! aiaumgy ,E AZZezz INVENTORS ATTORNEY Oct. 20, 1931. B..T. WILLISTON ET AL 1,823,533

INJECTOR FOR FEEDING WATER TO STEAM BOILERS Filed u 16, 1929 6 Sheets-Sheet 6 In j s I I H 4% H I 7 Ill 09 77 lull INVENTORaS' ATTORNEY Fatented @ct. 20, 1931 I UNITED STATES PATENT OFFICE BELVIN T. WILLISTON AND FREDERICK W. WALCH, OF SOMERVILLE; MASSACHUSETTS,

AND CHAUNCEY D. ALLEN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO CON- SOLIDATED ASHCROFT HANCOCK COMPANY, INC., NEW YORK, N. Y., A CORPORA- fion or NEW YORK INJECTOR FOR FEEDING WATER TO STEAM BOILERS Application filed AugustlG, 1929. Serial No. 386,321.

the use of preheaters of the smoke box type for heating, the maintenance problem is very difficult to handle.

In the past practice in connection with preheaters, the use of exhaust steam under pressure, and the efficiency of the heater was dependent upon the high exhaust steam pressure or back pressure of the engine. This would naturally encourage the excessive use of steam through the engine to obtain the required amount of back pressure for forcing its way through the heaters, and it has been proven conclusively that engines are more eflicient with reduced back pressure, or operated with as little exhaust steam as possible.

The purpose of the present invention is to simplify the now existing arrangement, and to provide an injector feeding device for the boiler, of a kind such as will have an extremely wide range oifeeding action, hence insure the delivery of hot Water at all times to the boiler, with exhaust steam condensed for preheating, and by steam entrainment provide a device of simple construction, and yet I easy to maintain.

In the present invention it is the purpose to provide a construction of device or app aratus especially adapted for entraining the exhaust steam from the exhaust cavities,

through the medium of a vacuum, thereby insuring the drawing of the required amount of exhaust steam. for preheating in the herein illustrated apparatus reducing the back pressure from the engine,'instead of having a back pressure built up and forcing its way into the heaters.

It is to be understood that the partlculars herein given are in no Way limitative, and that while still keeping within the scope of the invention, any desired modification of details and proportions may be made in the construction of the appliance according to circumstances.

The invention comprises further features and combination of parts to be hereinafter set forth, shown in the drawings and claimed.

In the drawings:

Figure 1 is a view in side elevation of a conventional type of locomotive, showing applied thereto the improved injector apparatus for feeding water to the steam boiler.

Figure 2 is a View taken on line 2-2 of Figure 1.

' Figure 3 is a longitudinal sectional View through a centrifugal pump, showing an injector forcer tube applied thereto.

Figure 4 is a sectional view on line 4-4: of Figure 3.

V Figure 5 is a longitudinal sectional view of the heater.

Figure 6 is a plan view of Figure 3.

Figure 7 is an end view of Figure 3.

Figure 8 is a sectional view through the valve 35a.

Referring more especially to the drawings 1 identifies a conventional type of locomotive and 2 is a hose bag, which receives its supply of water from the reservoir (not shown) to be carried by the tender. This hose bag 2 connects in any suitable manner at 3 with the heater 4, shown in elevation in Figure 1 and in section in Figure 5. This heater comprises-a casing'5, which has a depending wall 6 in tubular form dividing the casing 5 into chambers 7 and 8. The bottom of the casing 5 has a drain opening 9 closed by a threaded plug 10, the purpose of which is obvious.

Mounted by means of bolts 11-on a flanged extension 12 of the casing 5 is an extension casing 13, there being a perforated plate 14 interposed between flanges, where the casing 13 adjoins the flanged extension 12. Rising from'the plate 14 is a tubular guide 15, and guided thereon is a sleeve 16 carrying a valve 17. It is possible to entitle the parts 16 and 17 as a sleeve valve to cooperate with the seat 18, there being a coil spring 19 interposed between the plate 14 and the valve 17 to re tain the same in contact with the seat 18.

The seat 18 is formed on the lower face of an internal cylindrical wall 20 constructed internally of the casing 13. The upper end of the tubular guide 15 terminates in a head 21 causing a shoulder 22 to be formed. Also mounted for movement upon the tubular guide 15 is a valve 23, which comprises the circular part 24 and the sleeve part 25. The circular part 24 is provided with perforations or openings 26. The shoulder 22 limits the valve 23 in its upward movement, there be ing a coil spring 27 surrounding the cylindrical extension wall 20 and interposed between the shoulder 28 and the under surface of the circular part 24 of the valve 23. This spring 27 serves to retain the valve 23 in contact with the shoulder 22.

The'tubular guide 15 has diametrically opposite openings 29, which when the valve lowers sufliciently to uncover said openings 29, permit exhaust steam, which enters at 30, to pass through the tubular guide 15 and into the chamber 8. When the valve 23 lowers sufficiently to fully uncover the openings 29,

the circular part 24 of said valve 23 engages and rests upon the seat 31. There arenormal instances when the valve 23 is not moved sufliciently to uncover the openings 29, hence exhaust steam will pass through the openings 26 and hence into the chamber 32, caused to be formed by it, and then when the valve 17 lowers against the action of the spring 19 the exhaust steam will enter the chamber 33 and then through the openings 34 of the plate 14 and consequently into the chamber 8. The threaded opening at receives the pipe 35, which conducts exhaust steam from the exhaust cavities of the locomotive, for example from the valves and cylinders at 36. This opening 30 is formed through a flange plate 37, which is bolted at 38 to a flange of the easing 13. This connection of the steam exhaust pipe to the heater through the medium of the casing 13 and the attendant parts constitutes a control device C, which comprises the valves 23 and 17.

The pipe 35 for carrying the exhaust steam to the control device G has connected to it at 39 a pipe 40, which in turn connects at 41 to the centrifugal pump 42 shown in Figure 1 and in Figures 3, 4 and 6, the illustration in Figure 3 being a longitudinal sectional view through the pump. In the pipe 35 a positive control valve 35a is located connected by the pipe 35?) to delivery pipe 94 at 350 which allows exhaust steam to flow through the pipe 35 when pressure is in the pipe 94 thereby lifting check 35d by movement of piston 35g.

By means of this pipe steam is conducted from the centrifugal pump.

A nozzle 43 is'threaded at 44 in the casing 5 of the heater and is provided with diametrically opposite perforations 45. A nipple 46 is threaded to the casing 5 of the heater and is in turn threaded to the water inlet fitting 47, which has a threaded opening 48 for the reception of the plug 49. It is to be noted that the hose bag 2 is threaded to the water inlet fitting 47 as shown in Figure 1. Arranged in the water inlet fitting 47 isa perforated disc 50, which filters the supply of water before it enters the nozzle 43, that is I subsequently to having passed through the perforated plate 50.

Threaded in the wall 6 which divides the casing 5 into the chambers 7 and 8 is a tube 51, which is axial with the nozzle 43, and threadingly mounted in this tube 51 at a central location identified at 52 is a second tube 53, which may be entitled an entraining steam the entraining tube 53 is heated, and such u water passing through the entraining tube 53 after leaving the nozzle 43 at openings passes through the perforations or openings 57 when excessive vacuum occurs at the openings 57; Steam also passes through the open ings 58, just enough to prevent a space 61 (intervening between the entraining tube and the tube 51) from being a dead end. The water in assing through the heater and into the nozzl e 43 and through the tube 53 entrains exhaust steam at the point 62, namely where the tapered end of the nozzle 43 is relatively adjacent and axial to one end of the entraining tube 53, and at the time of entraining the exhaust steam at this point the water is heated, and it then passes through the. pipe 63, which is connected at 64 to a casing 65, which in turn is threaded into the casing 5 of the heater. One end of the entraining tube 53 fits closely within the casing 65 as at 66. This heated water after passing through the pipe 63 then enters the suction end 67 of the centrifugal pump impeller 68 of the pump 42. The water then passes through the internal cored pipe 69, which communicates at 70 with the pump impeller. The pipe 69 as shown in Figure turns up and is flanged, to which the flanged end of a pipe 71 is bolted at 72. The pipe 71 extends along the upper right hand side of the pump and is bolted at 73 to a boss or enlargement 74 formed on the casing of the pump 42. This boss 74 is an axialcontinuation of a tubular casing 75, which is made integral with the casing of the pump 42. Threaded to an annular shoulder at 76 on the interior of the casing and spaced from the internal surface thereof is a forcer tube 77. The forcer tube has an external integral collar 78, though not necessarily, which is threaded to the shoulder 76. The upper end of the forcer tube 77 as shown clearly in Figures 3 and 4 is enlarged and internally tapered at 79, 80 and 81, all three tapers being axial with the center of the forcer tube in an upwardly direction from the restricted throat 82. A nozzle 83 is threaded at 84 to the interior of the tubular boss 74, the nozzle 83 being limited in its position by the shoulder 85.

A pipe 86 from a steam valve 87 on the locomotive in Figure 1 is connected at 88 to the tubular extension of the boss 74, for the purpose of conducting steam through the nozzle 83 and into the forcer tube. The lower end of the forcer tube has its interior tapered as identified at 89. I

The lower end of the casing 7 5 terminates in a pipe 90, which extends in the direction of the suction end of the pump and parallel with the pump casing at a position slightly to one side of the center thereof, and through the medium of a coupling 91 comprising the plates 92 and the bolts 93, is connected to a pipe 94, which in turn connects to the boiler check 95. The pipe 94 in fact is threaded to a nipple 96, of the coupling 91. The coupling 91 is similar to the coupling 88. The pipe has a drain opening 97 closed by a threaded plug 98, and where the pipe 90 extends at right angles to the lower end of the casing 75 an opening 99 is provided. This opening 99 is closed by means of a plug 100 which constitutes the bottom of a chamber .in the lower part of the casing 75. The plug 100 has a depression 101 and rising from .the center ofthe depression is a projection 102, which tends toward breaking up the water and the steam. Extending from the steam valve 87 is a pipe 103, which is threaded at 104 into a valve casing 105, showing niore clearly in Figures 3 and 6, and mounted in the casing 105 is a valve seat ring 106, with which the valve 107 cooperates for supply of steam to propel pump. The overflow valve 107a may be swiveled in any suitable manner, preferably as identified at 108 in Figure 4 to the lower end of a valve stem 109. which is threaded at 110 in the crown portion 111 of the valve casing 105a. The

the nozzle 83 forces the water through the forcer tube into the passage of the pipe 90 and then through the pipe 94 to the boiler check: 95, the overflow valve 107 is open first to start circulation of Water through the the handle 124 excessive water in the chamber i 121 from the pipe 63 can be drained off at 125 to prevent freezing.

From the drawings and the specification it 'Will be noted that in this invention there is employed a centrifugal steam turbine driven all water impeller as the lifter side of aninjector, v

delivering Water under the required pressure, water being unheated with live steam pass ing from the boiler to the mouth of the forcer side of the injector. This enables a requisite Water pressure heated to the required temperature by exhaust steam or waste from the engine to be maintained for entry into the forcer tube. r

It is apparent in the art of jet apparatus vthat the limitations or range of temperature and feeding of injectors is cont-rolled by the degree of temperature of the suction Water in comparison to the pressure delivered to the forcer tubes. It will, therefore, be obvious that delivering the suction water by the use of a pump the restriction in range of suction temperature is overcome, and through the medium of the present device it is possible to use- Water of 190 temperature for feeding the forcer side'of the injector, wherein heretofore the limit has been 152 of water temperature.

In the present device it is constant control of the volume of exhaust steam that is entrained in the heater, the control being automatic, allowing the exhaust steam from the exhaust cavities of the engine not to enter the entrainer until a pressure of two pounds has been attained, or the amount, the device is regulated to accommodate, as accumulated in the exhaust cavities. that engines, particularly of the locomotive type, using exhaust steam for creating a draft on the fires mustfhave a prescribed amount for successful operation, therefore the automatic arrangement herein disclosed is to providefor an amount of steam to enter the entrainer from the exhaust pipe, without causing injurous effect on the draft of the fires.

'Heretofore boiler feeding devices of the preheater type deliver cold Water to the boiler, other than when supplying. live steam automatically or manually, when the engine is not operating, and is not providing exhaust steam, and this has proven injurous toboiler ill) It is to be understood plate pipe connections, etc., causing excessive maintenence.

In the present device the water is delivered to the boiler hot at all times owing to it being 5 heated through the medium of the steam nozzle and forcer tube with steam supplied direct from the boiler and without heat unit loss other than the slight amount by radiation.

In the present device exhaust steam is cut off from the heater at such times as the engine is workingand the boiler feed not working thereby preventing passage of exhaust steam to the tank consequently overheating of the tank water.

The invention having been set forth, what is claimed is:

' 1. In an injector apparatus for feeding water to steam boilers, the combination with an injector and a centrifugal pump including a no steam turbine driven water impeller as the lifter side of the injector, adapted to deliver Water under the required pressure to the mouth of the forcer side of the injector, of a heater connected at one end with a water :5 supply and at the other end with the suction end of the pump, and means for conducting exhaust steam from the exhaust cavities of an engine to the heater for entrainment by the water, thereby heating the Water prior to its entrance to the pump at the suction end thereof.

2. In an injector apparatus for feeding water to steam boilers, the combination with an injector and a centrifugal pump includin a steam turbine driven water impeller as %he lifter side of the injector, adapted to deliver water under the required pressure to the mouth of the forcer side of the injector, of a heater connected at one'end with a water supply and at the other end with the suction end of the pump, and means for conducting exhaust steam rom the exhaust cavities of an engine to the heater for entrainment by the water, thereby heating the water prior to its entrance to the pum at the suction end thereof, means connectlng one end of the injector with the main turret steam valve of the boiler, and means connecting the other end of the injector with the boiler check of the boiler.

3. In an injector apparatus for feedin water to steam boilers, the combination wit an injector and a centrifugal pump including a steam turbine driven water impeller deliver water under the required pressure to themouth of the forcer side of the injector,

' of a heater connected at one end with a water supply and at the other end with the suction end of the pump, and means for conducting exhaust steam from the exhaust cavities of an engine to the heater for entrainment by the water, thereby heating the wa ter prior to its entrance to the pump at the suction end thereof, and means for providing an overas the lifter side of the injector, adapted to flow for the injector, said last named means having a remote control therefor.

4. In an injector apparatus for feeding water to steam boilers, the combination with an injector and a centrifugal pump including a steam turbine driven Water impeller as the lifter side of the injector, of a water heater using exhaust steam as the heat medium with one end connected to a water supply, and its other end to the suction end of the pump impeller, means connecting the discharge end of the pump impeller and the injector, said injector including a steam nozzle and a forcer tube approximating the junction where the exhaust steam heated water enters the injector, means connecting a steam valve of the boiler beyond one end of the steam nozzle in the-injector, andmeans connecting the other end of the injector and the boiler check of the boiler.

5. In an injector apparatus for feeding water to steam boilers, an injector and a centrifugal pump including a steam turbine driven water impeller as the lifter side of the injector, for delivering water under the required pressure to the mouth of the forcer side of the injector, a heater connected at one end with a water supply and at the other end with the discharge end of the pump, said heater having a control device, and means for conducting exhaust steam from the exhaust cavities of an engine to the heater for entrainment by the water, thereby heating the water prior to its entrance at the pump at the suction end thereof, means connecting one end of the injector with the main turret steam valve of the boiler, means connecting the other end of the injector and the boiler check of the boiler, said injector having a forcer tube and a steam nozzle, and means connecting the discharge end of the pump and the injector at a point where the nozzle cooperates with the forcer tube.

6. An injector apparatus for feeding water to locomotive steam boilers, comprising a centrifugal pump including a power driven water impeller as the lifter side of the injector, said injector comprising a casing with one end connected to the main turret steam valve of the boiler, its other end being connected to the boiler check of the boiler, a forcer tube spacedly supported on the interior of the casing, a steam nozzle at the upper end of the forcer tube, and means connecting adjacent the nozzle where it cooperates with the forcer tube and the discharge end of the pump. 1

7. An injector apparatus for feeding water to locomotive steam boilers, comprising a celltrifugal pump including a power driven water impeller as the lifter side of the in-' jector, said injector comprising a casing with one end connected to the main turret steam valve of the boiler, its other end being connected to the boiler check of the boiler, a

forcer tube spacedly supported on the interior of the casing, a steam nozzle at the upper end of the forcer tube, and means connecting the casing adjacent the nozzle where it cooperates with the forcer tube and the discharge end of the pump, and a safety overflow valve including a remotely disposed control therefor.

8. An injector apparatus for feeding water to locomotive steam boilers, comprising a centrifugal pump including .a steam turbine driven water impeller as the lifter side of the injector, said injector comprising a casing with one end connected to the main turret steam valve of the boiler, its other end being connected to the boiler check of the boiler, a forcer tube spacedly supported on the interior of the casing, a steam nozzle at the upper end of the forcer tube, and means connecting the casing adjacent the nozzle where it cooperates with the forcer tube and the discharge end of the pump, and means for feeding exhaust steam heated water into the suction end of the pump impeller.

9. An injector apparatus for feeding water to locomotive steam boilers, comprising a centrifugal pump including a steam turbine driven water impeller as the lifter side of the injector, said injector comprising a casing with one end connected to the main turret steam valve of the boiler, its other end being connected to the boiler check of the boiler, a forcer tube spacedly supported on the interior of the casing, a steam nozzle at the upper end of the forcer tube, and means connecting the casing adjacent the nozzle where it cooperates with the forcer tube and the discharge end of the pump, and means for feeding exhaust steam heated water into the suction end of the pump impeller, and a safety overflow valve including a remotely disposed control therefor.

10. An injector comprising in combination with a centrifugal pump, a casing having a" forcer tube spacedly supported therewithin, said casing having a steam inlet, a steam nozzle in the path of the steam and closely associated with the mouth end of the forcer tube, means operatively connecting the injector closely adj acent the mouth of the forcer tube and the discharge impeller end of the pump.

11. An injector comprising in combination with a centrifugal pump, a casing having a forcer tube spacedly supported therewithin,

zle in the path of the steam and closely associated with the mouth end of the forcer tube,

means operatively connecting the injector closely adjacent the mouthof the forcer tube and the discharge impeller end of the pump, the lower end of the injector casing beyond the opposite end of the forcer tube being con nected with the boiler check of a boiler. l

12. An injector comprising in combination with a centrifugal pump, a casing having a forcer tube spacedly supported therewithin, said casing having a steam inlet, a steam nozzle in the path of the steam and closely associated with the mouth end of the forcer tube, means operatively connecting the injector closely adjacent the mouth of the forcer tube and the discharge impeller end of the pump, the lower end of the injector casing beyond the opposite end of the forcer tube being connected with the boiler check of a boiler, and a safety overflow valve for the injector including a remotely disposed manual control therefor, safety overflow valve being in turn connected to a fluid pressure chamber,

13. An injector comprising in combination with a centrifugal pump, a casing having a forcer tube spacedly supported therewithin, said casing having a steam inlet, a steam nozzle in the path of the steam and closely associated with the mouth end-of the forcer tube, means operatively connecting the injector closely adjacent the mouth end of the forcer tube and the discharge impeller end of the pump, the lower end of the injector casing beyond the opposite end of the forcer tube being connected, with the boilerv check of a boiler, and means comprising a heater connected at one end with a water supply and its other end connected to the suction end of the pump impeller, said heater including means to deliver exhaust steam to the heater to heat the water during its passage through the heater. f

14, An injector in combination with acentrifugal pump, consisting of a casing having a forcer tube spacedly supported there-within, said casing having a steam inlet, a steam nozzle in the path of the steam end and cooperatively associated in communication with the month end of the forcer tube, a heater in connection with the lifter side of the pump means operatively connecting the inector closely adjacent the mouth end of the forcer tube and'in turn communicating operatively in association. with the discharge end ofthe heater, the lowerend of the injector casing beyond the opposite end of the forcer tube being connected with a boiler check and means providing for the flow of the fluid from the pump through the heater, said heater including means for. entraining exhaust steam, thereby heating the water as said casing having a steam inlet, a steam noz-- passes through the heater" 15. In an apparatus for feeding water to engine steam boilers, a pump including a turbine driven ,water'impeller, an injector having a forcer tube therein and arranged to receive water from the. pump, a heater connected at one end with a water supply and at the other end with the suction end of the pump, and means for conducting exhaust steam from the exhaust cavities of an engine to the heater for entrainment by the water and thereby preheating the water for delivery into the suction end of the pump.

16. In an apparatus for feeding water to engine steam boilers, an injector having a forcer tube and arranged to receive water from a pump, a pump includin a turbine driven water impeller as the li ter side of the injector for the delivery of water under required pressure to the mouth of the forcer side of the injector, a heater with one end thereof connected to a water supply and its other end to the suction end of the pump, means for conducting exhaust steam from the exhaust cavities of the engine to the heater for entrainment by the water, said heater having an entraining throat, where in the water passing through the heater entrains the steam and is preheated thereby for delivery into the suction end of the pump.

17. In an apparatus for feeding water to engine steam boilers, a pump including a steam turbine driven power shaft, a water impeller as the lifter side of the pump and actuated by said shaft, a chamber for said impeller, an injector receiving water from the impeller chamber, and means connecting the injector and a source of live steam from the engine, for entraining the water through the injector.

"18. In an apparatus for feeding water to engine steam oilers, a pump having steam operated means as the power side of the pump, and a water impeller as the lifter side of the pump associated with and operated by the power side, an injector including a forcer tube receiving water from the lifter side of pump, and means connected to a source of live steam from the engine with the injector fog entraining the Water through the foroer tu e.

19. In an apparatus for feeding water to engine steam boilers, a pump having steam operated means as the power side of the pump, and a water impeller as the lifter side of the pump associated with and operated by the power side, an injector including a forcer tube receiving water from the lifter side of the pump, and means connected to a source of live steam from the engine with the injector for entraining the water throu h the forcer tube, a heater connected to t e lifter side of the pump and in turn to a water supply, and means for conducting exhaust steam from the exhaust cavities of the engine to the heater for entrainment by the water and thereby reheating the water for delivery into the li r side of the pump.

In witness whereof the applicants signatures are hereto aflixed.

BELVIN T. WILLISTON. FREDERICK W. WALGH. CHAUNCEY D. ALLEN. 

